Reference guide to Ortho assessment and tx need

Question 1

what does grade 3 indicate

Answer 1

borderline need

Question 2

what does grade 4 indicate

Answer 2

need treatment

Question 3

what does grade 5 indicate

Answer 3

need treatment

Question 4

primary dentition normal development

Answer 4

normal eruption pattern
spacing is normal (primate spaces)
encourage cessation of thumb sucking before 5 years old

Question 5

indications for referral primary dentition

Answer 5

severe skeletal discrepancies
severely delayed dental development
missing/ supplemental teeth
history of head and neck radiotherapy
advice for balancing/ compensating extractions

Question 6

normal development mixed dentition

Answer 6

normal eruption pattern
contralateral teeth should erupt within 6/12
midline diastema normal
maxillary canines palpable at 10 years old

Question 7

indications for referral mixed dentition

Answer 7

severe skeletal patterns
dental anomalies
missing permanent teeth
supernumerary teeth
teeth in unfavourable positions e.g., canines
impacted first permanenet molars
infraoccluded teeth
crossbites
extraction advice where severe crowding evidence or first molars have poor prognosis
advice following trauma

Question 8

permanent dentition normal development

Answer 8

skeletal base acceptable
all permanent teeth present
class I incisors
class I molar relationship
average overjet - 2-4mm
average overbite - 1/3 of lower inc coverage
well aligned arches

Question 9

indications for referral permanent dentition

Answer 9

IOTN 3 or above